Cisco Catalyst 4500 Series Software Configuration Guide

5-7
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 5 Configuring Virtual Switching Systems
Understanding Virtual Switching Systems
Asymmetric chassis support
Ensure that both participating switches in the VSS have the same supervisor engine type. The chassis
can differ in type (i.e., +E and -E chassis can be in a single VSS) and also can differ in the number of
slots in chassis. VSS cannot be formed between different flavors of Catalyst 4500X (e.g., 4500X-16 and
4500X-32).
Interface Naming Convention
In VSS mode, interfaces are specified using the switch number (in addition to slot and port), because the
same slot numbers are used on both chassis. For example, the interface 1/5/4 command specifies port 4
of the switching module in slot 5 of switch 1. The interface 2/5/4 command specifies port 4 on the
switching module in slot 5 of switch 2.
Module Number Convention
IOS treats modules in both chassis as if they belong to one single chassis and the module number space
is 1-20.
Switch 1 receives a module number from 1-10 and switch 2 receives a number from 11-20, irrespective
the chassis type, supervisor type, or number of slots in a chassis. For example, on a 3-slot chassis VSS,
the module numbers on switch 1 would be 1, 2, and 3, and on switch 2, the numbers would be 11, 12,
and 13. The module number on switch 2 always starts from 11.
The show switch virtual slot-map command provides virtual to physical slot mapping. The following
is a sample output:
Virtual Remote Physical Module
Slot No Switch No Slot No Uptime
---------+-----------+----------+----------
1 1 1 00:24:14
2 1 2 00:23:46
3 1 3 -
4 1 4 -
5 1 5 -
6 1 6 -
7 1 7 -
8 1 8 -
9 1 9 -
10 1 10 -
11 2 1 00:22:03
12 2 2 00:24:43
13 2 3 00:24:43
14 2 4 -
15 2 5 -
16 2 6 -
17 2 7 -
18 2 8 -
19 2 9 -
20 2 10 -
Key Software Features not Supported on VSS
With some exceptions, the VSS maintains feature parity with the standalone Catalyst 4500 or 4500-X
series switches. Major exceptions include:
4510R+E 4 4 4 4
4510R+E 4 4 4 4

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E